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Arrests Raise Fears of American Jihad

U.S. counterterrorism officials say 2009 has turned into the year of homegrown jihad, with the unmasking of the most serious suspected terror plots involving Americans in about five years.

U.S. investigators are still trying to determine what drew five young Americans to travel last month to Pakistan, where local authorities allege they had sought to join extremist groups that have attacked U.S. soldiers in Afghanistan. U.S....